/arch/s390/include/asm/kvm_para.h

  1/*
  2 * asm-s390/kvm_para.h - definition for paravirtual devices on s390
  3 *
  4 * Copyright IBM Corp. 2008
  5 *
  6 * This program is free software; you can redistribute it and/or modify
  7 * it under the terms of the GNU General Public License (version 2 only)
  8 * as published by the Free Software Foundation.
  9 *
 10 *    Author(s): Christian Borntraeger <borntraeger@de.ibm.com>
 11 */
 12
 13#ifndef __S390_KVM_PARA_H
 14#define __S390_KVM_PARA_H
 15
 16#ifdef __KERNEL__
 17
 18/*
 19 * Hypercalls for KVM on s390. The calling convention is similar to the
 20 * s390 ABI, so we use R2-R6 for parameters 1-5. In addition we use R1
 21 * as hypercall number and R7 as parameter 6. The return value is
 22 * written to R2. We use the diagnose instruction as hypercall. To avoid
 23 * conflicts with existing diagnoses for LPAR and z/VM, we do not use
 24 * the instruction encoded number, but specify the number in R1 and
 25 * use 0x500 as KVM hypercall
 26 *
 27 * Copyright IBM Corp. 2007,2008
 28 * Author(s): Christian Borntraeger <borntraeger@de.ibm.com>
 29 *
 30 * This work is licensed under the terms of the GNU GPL, version 2.
 31 */
 32
 33static inline long kvm_hypercall0(unsigned long nr)
 34{
 35	register unsigned long __nr asm("1") = nr;
 36	register long __rc asm("2");
 37
 38	asm volatile ("diag 2,4,0x500\n"
 39		      : "=d" (__rc) : "d" (__nr): "memory", "cc");
 40	return __rc;
 41}
 42
 43static inline long kvm_hypercall1(unsigned long nr, unsigned long p1)
 44{
 45	register unsigned long __nr asm("1") = nr;
 46	register unsigned long __p1 asm("2") = p1;
 47	register long __rc asm("2");
 48
 49	asm volatile ("diag 2,4,0x500\n"
 50		      : "=d" (__rc) : "d" (__nr), "0" (__p1) : "memory", "cc");
 51	return __rc;
 52}
 53
 54static inline long kvm_hypercall2(unsigned long nr, unsigned long p1,
 55			       unsigned long p2)
 56{
 57	register unsigned long __nr asm("1") = nr;
 58	register unsigned long __p1 asm("2") = p1;
 59	register unsigned long __p2 asm("3") = p2;
 60	register long __rc asm("2");
 61
 62	asm volatile ("diag 2,4,0x500\n"
 63		      : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2)
 64		      : "memory", "cc");
 65	return __rc;
 66}
 67
 68static inline long kvm_hypercall3(unsigned long nr, unsigned long p1,
 69			       unsigned long p2, unsigned long p3)
 70{
 71	register unsigned long __nr asm("1") = nr;
 72	register unsigned long __p1 asm("2") = p1;
 73	register unsigned long __p2 asm("3") = p2;
 74	register unsigned long __p3 asm("4") = p3;
 75	register long __rc asm("2");
 76
 77	asm volatile ("diag 2,4,0x500\n"
 78		      : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
 79			"d" (__p3) : "memory", "cc");
 80	return __rc;
 81}
 82
 83
 84static inline long kvm_hypercall4(unsigned long nr, unsigned long p1,
 85			       unsigned long p2, unsigned long p3,
 86			       unsigned long p4)
 87{
 88	register unsigned long __nr asm("1") = nr;
 89	register unsigned long __p1 asm("2") = p1;
 90	register unsigned long __p2 asm("3") = p2;
 91	register unsigned long __p3 asm("4") = p3;
 92	register unsigned long __p4 asm("5") = p4;
 93	register long __rc asm("2");
 94
 95	asm volatile ("diag 2,4,0x500\n"
 96		      : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
 97			"d" (__p3), "d" (__p4) : "memory", "cc");
 98	return __rc;
 99}
100
101static inline long kvm_hypercall5(unsigned long nr, unsigned long p1,
102			       unsigned long p2, unsigned long p3,
103			       unsigned long p4, unsigned long p5)
104{
105	register unsigned long __nr asm("1") = nr;
106	register unsigned long __p1 asm("2") = p1;
107	register unsigned long __p2 asm("3") = p2;
108	register unsigned long __p3 asm("4") = p3;
109	register unsigned long __p4 asm("5") = p4;
110	register unsigned long __p5 asm("6") = p5;
111	register long __rc asm("2");
112
113	asm volatile ("diag 2,4,0x500\n"
114		      : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
115			"d" (__p3), "d" (__p4), "d" (__p5)  : "memory", "cc");
116	return __rc;
117}
118
119static inline long kvm_hypercall6(unsigned long nr, unsigned long p1,
120			       unsigned long p2, unsigned long p3,
121			       unsigned long p4, unsigned long p5,
122			       unsigned long p6)
123{
124	register unsigned long __nr asm("1") = nr;
125	register unsigned long __p1 asm("2") = p1;
126	register unsigned long __p2 asm("3") = p2;
127	register unsigned long __p3 asm("4") = p3;
128	register unsigned long __p4 asm("5") = p4;
129	register unsigned long __p5 asm("6") = p5;
130	register unsigned long __p6 asm("7") = p6;
131	register long __rc asm("2");
132
133	asm volatile ("diag 2,4,0x500\n"
134		      : "=d" (__rc) : "d" (__nr), "0" (__p1), "d" (__p2),
135			"d" (__p3), "d" (__p4), "d" (__p5), "d" (__p6)
136		      : "memory", "cc");
137	return __rc;
138}
139
140/* kvm on s390 is always paravirtualization enabled */
141static inline int kvm_para_available(void)
142{
143	return 1;
144}
145
146/* No feature bits are currently assigned for kvm on s390 */
147static inline unsigned int kvm_arch_para_features(void)
148{
149	return 0;
150}
151
152#endif
153
154#endif /* __S390_KVM_PARA_H */